Tencent Cloud Block Storage (CBS) is a highly available and highly reliable block storage device for CVM instances. It provides a wide variety of disks to meet diversified read/write requirements. For more information on CBS, see Overview.
We recommend CBS when the data frequently changes and you want to persistently store them at a faster read/write speed. CBS can be attached to any running instance in the same availability zone, enabling you to use an instance’s file system and database storage without following the instance lifecycle. For more information on the CBS operations, see Operation Overview.
Tencent Cloud CBS comes with four disk types: Premium Cloud Storage, SSD, Enhanced SSD, and Tremendous SSD. All four types offer the following features:
Cloud Object Storage is available via Web APIs, and is not restricted by file systems, directory structure, number of files, or storage capacity. The service offers various SDKs and tools for business integration, which can also be used independently from CVM. COS is great when you need to access massive amounts of data but is not ideal for millisecond-level response or random read/write scenarios.
Cloud Block Storage needs to be used together with CVM and can only be attached and used after the file system is partitioned or formatted. COS and CBS both have distinct performance metrics for different use cases.
When you attach a monthly subscribed elastic cloud disk to a monthly subscribed CVM, as instructed in Attaching Cloud Disks, the following renewal-related options are available:
- Unified expiry time with the CVM
- Enable monthly auto-renewal of the cloud disks
- Attach directly without enabling auto-renewal
Cloud disks offer high reliability, elasticity, and performance. They are easy to use and support snapshot backup. For more information, see Product Strengths.
No. System disks cannot be attached or detached.
Yes. All types of local disks and cloud disks can be used as data disks.